I also upgraded days ago, assuming they would have had time to fix the bugs. However, I can say the USB-C external screen flicker was plaguing me before the upg

I also upgraded days ago, assuming they would have had time to fix the bugs. However, I can say the USB-C external screen flicker was plaguing me before the upgrade and hasn't gotten worse. Turning off hot corners, oddly, helped, although the problem hasn't gone away.